40 GB of the first Inuyasha series. I was disappointed to learn that it stopped rather abruptly. I found the "final act" series later though.
That's how I felt with "Rave Master" and "Berserk"
Shikabane Hime was going to be my all-time favorite anime, because the series was so awesome.
Then I got to the last episode... You want to talk about "abrupt"?
It ends in the middle of someone throwing a punch, in the fight you've been waiting the whole series to see. Wtf?